规则型数据采掘工具集AMINER

介绍了一个规则型数据采掘工具集AMINER ,其目标是增强知识表达的能力 ,并形成一个实用的数据采掘工具 ,使其能适用于多种不同的应用领域。工具集以一定程度上通用的CRD方法为基本采掘算法 ,分为数据预处理、数据采掘和数据评价三大主要模块。系统原型是一个在关系或演绎数据库中采掘规则型知识 ,并对领域知识和采掘结果进行管理的系统 ,其主要功能包括数据采掘、领域知识的管理和采掘结果的管理。最后 ,对未来的工作提出了展望。

Expression of octopaminergic receptor genes in 4 nonneural tissues in female Nicrophorus vespilloides beetles

Octopamine regulates the function of many tissues and physiological processes in invertebrates. The expression of octopamine receptor genes has been examined in multiple tissue types in several different insect orders. However, little work has addressed this issue in Coleoptera. Most studies characterize individual genes in different tissue types, but here we describe the expression of 6 octopamine receptor genes in thoracic musculature, oviducts, Malpighian tubules, and fat body of female Nicrophorus vespilloides beetles to characterize both different genes and different tissues within a single study. We then compare the gene expression profiles found in this beetle to other insects to examine the extent to which expression profiles are conserved across insects. We also examine the relative involvement of octopamine verses octopamine/tyramine receptors based on receptor gene expression in each tissue to help elucidate if tyramine plays a role in the regulation of these tissues. We find a high degree of overlap in the expression profile of the 6 genes examined in the thoracic muscula^tre, a moderate amount for the oviducts, and divergent profiles for Malpighian tubules and fat body. Based on expression difference in receptor subtypes, our results also support the suggestion that tyramine is a biogenic amine with physiological actions separate from octopamine.

3D printing of poly(ethyleneimine)-functionalized Mg-Al mixed metal oxide monoliths for direct air capture of CO_(2)

Direct air capture(DAC)of CO_(2)plays an indispensable role in achieving carbon-neutral goals as one of the key negative emission technologies.Since large air flows are required to capture the ultradilute CO_(2)from the air,lab-synthesized adsorbents in powder form may cause unacceptable gas pressure drops and poor heat and mass transfer efficiencies.A structured adsorbent is essential for the implementation of gas-solid contactors for cost-and energy-efficient DAC systems.In this study,efficient adsorbent poly(ethyleneimine)(PEI)-functionalized Mg-Al-CO_(3)layered double hydroxide(LDH)-derived mixed metal oxides(MMOs)are three-dimensional(3D)printed into monoliths for the first time with more than 90%adsorbent loadings.The printing process has been optimized by initially printing the LDH powder into monoliths followed by calcination into MMO monoliths.This structure exhibits a 32.7%higher specific surface area and a 46.1%higher pore volume,as compared to the direct printing of the MMO powder into a monolith.After impregnation of PEI,the monolith demonstrates a large adsorption capacity(1.82 mmol/g)and fast kinetics(0.7 mmol/g/h)using a CO_(2)feed gas at 400 ppm at 25℃,one of the highest values among the shaped DAC adsorbents.Smearing of the amino-polymers during the post-printing process affects the diffusion of CO_(2),resulting in slower adsorption kinetics of pre-impregnation monoliths compared to post-impregnation monoliths.The optimal PEI/MeOH ratio for the post-impregnation solution prevents pores clogging that would affect both adsorption capacity and kinetics.

Achieving a superior Na storage performance of Fe-based Prussian blue cathode by coating perylene tetracarboxylic dianhydride amine

Fe-based Prussian blue(Fe-PB)cathode material shows great application potential in sodium(Na)-ion batteries due to its high theoretical capacity,long cycle life,low cost,and simple preparation process.However,the crystalline water and vacancies of Fe-PB lattice,the low electrical conductivity,and the dissolution of metal ions lead to limited capacity and poor cycling stability.In this work,a perylene tetracarboxylic dianhydride amine(PTCDA)coating layer is successfully fabricated on the surface of Fe-PB by a liquid-phase method.The aminated PTCDA(PTCA)coating not only increases the specific surface area and electronic conductivity but also effectively reduces the crystalline water and vacancies,which avoids the erosion of Fe-PB by electrolyte.Consequently,the PTCA layer reduces the charge transfer resistance,enhances the Na-ion diffusion coefficient,and improves the structure stability.The PTCA-coated Fe-PB exhibits superior Na storage performance with a first discharge capacity of 145.2 mAh g^(−1) at 100 mA g^(−1).Long cycling tests exhibit minimal capacity decay of 0.027%per cycle over 1000 cycles at 1 A g^(−1).Therefore,this PTCA coating strategy has shown promising competence in enhancing the electrochemical performance of Fe-PB,which can potentially serve as a universal electrode coating strategy for Na-ion batteries.

Effect of the presence of trace sulfur dioxide on piperazine-based amine absorbents for carbon dioxide capture

The effect of the presence of trace SO_(2)in industrial flue gas on the amine-scrubbing-based absorption process for CO_(2)capture has been a matter of concern.This study aimed to investigate the effect of trace SO_(2)on the CO_(2)capture process using piperazine-based amine absorbents,focusing on SO_(2)-resistance capability,SO_(2)/CO_(2)absorption selectivity,and cyclic stability.The presence of trace SO_(2)not only restrains CO_(2)absorption,but also promotes the formation of carbamate within the piperazine-based amine absorbents.Remarkably,the incorporation of aminoethyl group in piperazine-based amine absorbents can enhance the SO_(2)-resistance capability by promoting the formation of carbamate,while piperazine-based amine absorbents with hydroxyethyl group can promote the formation of bicarbonate to reduce the SO_(2)-resistance capability.The work offers valuable insights into the efficient application of novel amine absorbents for CO_(2)capture from practical industrial flue gas.

Effects of potassium lactate on sensory attributes,bacterial community succession and biogenic amines formation in Rugao ham

To deepen the understanding in the effect of potassium lactate on the sensory quality and safety of Rugao ham,sensory attributes,physicochemical parameters,total volatile basic nitrogen(TVBN),microorganism community and biogenic amines of Rugao ham manufactured with different potassium lactate levels(0%,0.5%,1%,2%)were investigated;the relationship between microbial community and the formation of TVBN and biogenic amines was further evaluated.With the increase of potassium lactate from 0%to 2%,the increased sensory scores and the decreased total aerobic bacterial count and TVBN were observed;the abundance of Staphylococcus increased,while the content of Halomonas decreased.LDA effect size(LEf Se)and correlations analysis showed that Staphylococcus equorum and Lactobacillus fermentum could be the key species to improve sensory scores and decrease biogenic amines and TVBN.Metabolic pathway analysis further showed that amino acids metabolism and nitrogen metabolism were mainly involved in decreasing TVBN and biogenic amines in the treatment of 2%potassium lactate.

Evolution of free amino acids, biogenic amines and volatile compounds in fermented sausages inoculated with Lactiplantibacillus plantarum and Staphylococcus simulans

Lactic acid bacteria and coagulase-negative staphylococci play an important role in the production of fermented sausages,such as inhibiting the growth of undesirable bacteria and antioxidant.In this study,the effects of inoculation with different starter cultures(Lactiplantibacillus plantarum HN108 and Staphylococcus simulans NJ209)on the free amino acids(FAAs),biogenic amines(BAs)and volatile compounds of fermented sausages were investigated using an amino acid analyzer,ultra performance liquid chromatography and gas chromatography-ion mobility spectrometry,respectively.The pH and carbonyl content of the inoculated group was significantly lower than those in the control group(P<0.05).L.plantarum HN108 significantly reduced the content of FAAs and BAs in fermented sausage production(P<0.05),while S.simulans NJ209 promoted the formation of FAAs(especially bitter amino acids)and exhibited slight BAs-reducing activity.In addition,L.plantarum HN108 promoted the formation of volatile compounds such as ketones,alcohols and alkenes in sausages.In conclusion,L.plantarum HN108 could contribute to reducing the content of putrescine and tyramine and forming the desirable flavor compounds in fermented sausages.Thus,L.plantarum HN108 is expected to be a starter culture that can improve the safety and flavor of fermented sausages.

Color and Gloss Changes of a Lignin-Based Polyurethane Coating under Accelerated Weathering

The purpose of this research study was to investigate the properties of polyurethane coatings based on lignin nano-particles.For this purpose,the prepared coatings were applied to pine wood surfaces and weathered artificially.Subsequently,color and gloss of the coatings were measured before and after the weathering test.Field emission scanning electron microscopy(FE-SEM)micrographs prepared from the coatings showed that the average size of nano-particles in the polyurethane substrate was approximately 500 nm.Nuclear magnetic resonance(13C-NMR)spectroscopy showed that strong urethane bonds were formed in the nano-lignin-based polyurethane.Differential calorimetric analysis(DSC)test revealed that the glass-transition temperature(Tg)of lignin nanoparticles modified with diethylenetriamine(DETA)was 112.8℃ and Tg of lignin nano-particles modified with ethylenediamine(EDA)was 102.5℃,which is lower than the Tg of un-modified lignin(114.6℃)and lignin modified with DETA(126.8℃)and lignin modified with EDA(131.3℃).The coatings modified with lignin nano-particles had a greater change in gloss.The lignin nano-particles in the modified coating are trapping hydroxyl radicals which reduces photoactivity and yellowing of the polyurethane by about 3 times compared to unmodified polyurethane coatings.After weathering test,the nano-lignin-based coating had a rougher surface with a lower contact angle(0.78°)compared to the unmodified polyurethane coating(0.85°).

One-pot Synthesis of MoO_(3)/PI Composite with Enhanced Photocatalytic Performance for Oxidative Coupling of Amines to Imines

Organic-inorganic MoO_(3)/PI(MoPI)composites were prepared using a simple one-pot thermal copolymerization method.The resulting composites exhibited enhanced photocatalytic activity for the selective oxidation of benzylamine to N-benzylidene benzylamine(N-BDBA)in ambient air under simulated solar light irradiation compared to pristine MoO_(3) or polyimide(PI).In particular,the MoPI composite with a 0.3:1 molar ratio of Mo to melamine,referred to as MoPI-0.3,demonstrated the best performance in the photo-oxidation of benzylamine,achieving a benzylamine conversion of 95%with a N-BDBA selectivity exceeding 99%after 3 h irradiation.The enhanced photocatalytic activity of the MoPI-0.3 catalyst was attributed to the formation of a direct Z-scheme heterojunction between MoO_(3) and PI,facilitating more efficient separation of the photoinduced electrons and holes.Additionally,the MoPI-0.3 composite maintained considerably high activity over four consecutive cycles,highlighting its good stability and recyclability.Furthermore,the MoPI-0.3 composite could photo-oxidize benzylamine derivatives and heterocyclic amines to their corresponding imines,demonstrating the universal applicability of this composite catalyst.

Activation mechanism of conventional electrolytes with amine solvents:Species evolution and hydride-containing interphase formation

Rechargeable magnesium(Mg)-metal batteries have brought great expect to overcome the safety and energy density concerns of typical lithium-ion batteries.However,interracial passivation of the Mgmetal anode impairs the reversible Mg plating/stripping chemistries,resulting in low Coulombic efficiency and large overpotential.In this work,a facile isobutylamine(IBA)-assisted activation strategy has been proposed and the fundamental mechanism has been unveiled in a specific way of evolving active species and forming MgH_(2)-based solid-electrolyte interphase.After introducing IBA into a typical electrolyte of magnesium bis(trifluoromethanesulfo nyl) imide(Mg(TFSI)_(2)) in diglyme(G2) solvents,electrolyte species of [Mg^(2+)(IBA)5]^(2+) and protonated amine-based cations of [(IBA)H]^(+) have been detected by nuclear magnetic resonance and mass spectra.This not only indicates direct solvation of IBA toward Mg^(2+)but also suggests its ionization,which is central to mitigating the decomposition of G2 and TFSI anions by forming neutrally charged [(IBAH^(+))(TFSI^(-))]~0 and other complex ions.A series of experiments,including cryogenic-electron microscopy,D_(2)O titration-mass spectra,and time of flight secondary ion mass spectrometry results,reveal a thin,non-passivated,and MgH_(2)-containing interphase on the Mg-metal anode.Besides,uniform and dendrite-free Mg electrodeposits have been revealed in composite electrolytes.Benefiting from the activation effects of IBA,the composite electrolyte displays superior electrochemical performance(overpotential is approximately 0.16 V versus 2.00 V for conventional electrolyte;Coulombic efficiency is above 90% versus <10% for conventional electrolyte).This work offers a fresh direction to advanced electrolyte design for next-generation rechargeable batteries.

Mono Ethanol Amine (MEA) Pulping of Wheat Straw: An Environmentally Friendly Suggestion for the Fluff Pulp Production

This research aimed to investigate the effect of pulping conditions and refining intensities of wheat straw to be recommended for fluff pulp production.For this purpose,mono ethanol amine(MEA)was selected as a de-lignification agent at three levels of 50:50,25:75,and 15:85(MEA/water,W/V%),and soda-AQ 14 W/V%was used as a reference pulping.To investigate the optimal refining intensity,the obtained pulp was passed through a single disk laboratory refiner from 0 to 6 times and in two different consistencies(1.5 and 2.5 W/V%).Total yield,kappa number,ash content,and the Schopper-Riegler(SR°)freeness of the prepared pulps were investigated.Finally,hand sheets with a targeted basic weight of 70 g/m^(2) were made according to the related standards.The hand sheets were characterized using Fourier transform infrared(FTIR)spectroscopy and a field emission scanning electron microscope(FE-SEM).Sheet density,brightness,and mechanical properties such as burst,tensile,and tear indices were also investigated.The FE-SEM photographs showed that the texture of the hand sheet became denser as the refining intensity increased.External fibrillation on the surface of the fibers was also observed,especially on those refined with 2.5%consistency.The results of the chemical composition of wheat straw indicated that wheat straw containing a high percentage of holocellulose is an excellent candidate for the production of fluff pulp.The total yield and kappa number of MEA pulps increased with the decrease in MEA concentration.FTIR results indicated the presence of a peak related to amino groups in the pulp related to MEA pulp.The results also indicated that the mechanical properties of the papers,except for the tear index,were enhanced as the intensity of refining and the pulp consistency during refining increased.

气相色谱法测定氟苯尼考中二乙胺和三乙胺残留

建立气相色谱法测定氟苯尼考中二乙胺和三乙胺残留的方法。采用Inert Cap for Amines毛细管胺类测试柱,经惰性处理的衬管,载气为氮气,流速3.0 mL/min,分流比为5∶1,检测器为FID。结果表明:该方法中二乙胺、三乙胺与其相邻峰完全分离;对照峰面积RSD均小于2%;二乙胺的检测限浓度为1.84μg/mL,定量限浓度为3.67μg/mL,在3.67~13.76μg/mL浓度范围内线性相关系数r为0.995 9;三乙胺的检测限浓度为0.50μg/mL,定量限浓度为1.50μg/mL,在1.50~374.63μg/mL浓度范围内线性相关系数r为0.998 6;二乙胺的回收率90.7%~103.0%,三乙胺的回收率90.8%~97.3%;小幅改变色谱条件,耐用性良好。方法操作简单、准确度高、重复性好,适用于氟苯尼考中二乙胺、三乙胺残留的测定。

中国人工智能国际合作顶尖专家识别与评价

[目的/意义]旨在通过对中国人工智能国际合作顶尖专家进行识别与评价,以期为加强中国人工智能国际合作提供参考。[方法/过程]以人工智能领域H指数大于40的专家确定为顶尖专家进行研究,依托Aminer科技大数据平台,对中国人工智能国际合作的顶尖专家进行识别,并利用Topsis法对专家的综合学术水平进行评价。[结果/结论]针对与中国有国际合作的顶尖专家识别结果,发现:(1)中、美两国的专家合作数远高于其余国家之和;(2)专家以男性为主导,女性比例极低;(3)专家所属机构分布在全球22个国家(地区),机构分布与各地区的科技、经济实力情况大体一致;(4)部分专家拥有学校研究人员及企业科学家双重身份;(5)中、美专家在论文学术领域的国际合作占据主导地位。国际迁移合作以中国学者到国外学习深造或工作为主,同时对国外专家引进的迁移合作,仍以美国专家作为优先对象。同时,Topsis评价结果显示中国人工智能的国际合作虽然已经全面铺开,但是与部分顶尖专家仍然未建立有效的直接交流合作。

Thermodynamics and kinetics of adsorption for heavy metal ions from aqueous solutions onto surface amino-bacterial cellulose

Amino-bacterial cellulose（amino-BC） was prepared by chemical modification of bacterial cellulose（BC）.The adsorption characteristics and mechanism of amino-BC were studied.The results show that adsorption data can be fitted well by Langmuir equation and the pseudo-second order kinetics,indicating that the adsorption of amino-BC would obey monolayer molecule adsorption and the main action was chemisorption.Meanwhile,the adsorption process was studied by the Elovich equation and the intra-particle diffusion model,indicating that the absorption characteristics of metal ions on amino-BC is controlled by both film diffusion and particle diffusion.The increase of reaction temperature will accelerate the adsorbing rate because of endothermic reaction.

面向多领域跨学科的专家遴选算法

为有效解决基于学科目录进行专家遴选方法的不足,提出一种面向多领域跨学科的专家遴选算法CD-Selection。将专家的研究方向关键词作为专家特征,使用Word2vec算法对论文与专家的研究方向关键词分别进行词语向量化;基于欧氏距离计算论文与专家研究方向关键词的词向量相似度;基于论文研究方向关键词的TF-IDF统计值,结合论文与专家的相似度计算专家匹配度,实现多领域跨学科的专家遴选。实验采用Aminer系统抽取的1043个专家的数据集,其结果表明,CD-Selection算法专家遴选匹配率达到90%以上。

Dynamics simulation of tertiary amines adsorbing on kaolinite(001) plane

The collecting power of tertiary amines（DRN,DEN and DPN） on kaolinite follows the order of DENDPNDRN.After reacting with DRN,DEN and DPN,the surface potentials of kaolinite increase remarkably,and the recruitments caused by collectors also follow the order of DENDPNDRN.The results of dynamics simulation show that the geometries of substituent groups bonding to N are deflected and twisted,and some of bond angles are changed when tertiary amines cations adsorb on kaolinite（001） surface.Based on the results of dynamics simulations and quantum chemistry calculations,the electrostatic forces between three tertiary amines cations and 4×4×3（001） plane of kaolinite are 1.38×10？7 N（DRN12H＋）,1.44×10-6 N（DEN12H＋）,1.383×10-6 N（DPN12H＋）,respectively.

用伯胺7101从钒渣浸出液中萃取钒

研究了用伯胺7101从钒渣浸出液中萃取钒，考察了萃取剂组成、两相接触时间对钒萃取率的影响，以及反萃取剂组成、温度及两相接触时间对钒反萃取率的影响。试验结果表明：对于钒质量浓度为17 g/L的钒净化液，用10％7101＋10％仲辛醇＋80％煤油作萃取剂，在常温、相比V o/V a＝1/1条件下萃取5 min ，钒萃取率在90％以上，萃取剂饱和容量为29．5 g/L ；对于负载17．0 g/L钒的有机相，用170 g/L的（N H4）2 CO3溶液作反萃取剂反萃取沉淀钒，控制相比V o/V a ＝1/1，温度为35～40℃，两相接触15 min ，钒的反萃取率达99％，所得五氧化二钒产品质量质量优于YB/T5304-2011冶金99级标准。

柞蚕丝/纤维素在离子液体中的溶解及再生纤维的结构与性能

为改善再生蛋白质纤维的综合性能,以柞蚕丝下脚料和棉浆粕为原料,以氯代1-烯丙基-3-甲基咪唑([Amin]Cl)为溶剂,采用干湿纺工艺纺制再生柞蚕丝/纤维素共混纤维,考察柞蚕丝/纤维素的共溶解行为,并研究再生共混纤维的结构和性能。结果表明:在微波作用下,柞蚕丝在[Amin]Cl中具有良好的溶解性能,可通过调节微波作用时间调控柞蚕丝在[Amin]Cl中的溶解速率;随着剪切速率的增加,不同共混比的柞蚕丝/纤维素纺丝液的剪切黏度均表现出逐渐下降的趋势,呈现出明显的“切力变稀”行为,说明该纺丝液为典型的假塑性流体;再生共混纤维的超分子结构和天然柞蚕丝纤维一致,均为β-折叠结构和α-螺旋结构,且共混纤维表面具有疏松网状结构,断面结构致密紧凑;再生共混纤维的力学性能优良,断裂强度和初始模量较天然柞蚕丝纤维分别提高了8.46%和21.45%,热机械性能优于纤维素纤维,表现出较好的热稳定性。

高压直流系统改进型最小换相裕度控制策略

高压直流系统直流侧发生单极故障时,故障极会引起非故障极直流电流增大,严重时可能引起非故障极换相失败。在直流电流增大的情况下,现有最小换相裕度(AMIN)控制无法启动紧急触发来避免换相失败。针对现有AMIN控制无法精确计算实时换相裕度面积的问题,文中根据现有策略的理论推导,首先分析其未能达到预期效果的影响因素;然后,根据分析结果提出考虑换相过程中直流电流变化、电气量采样延时补偿及预测控制的改进型AMIN控制策略;最后,基于与实际控制保护程序一致的直流工程PSCAD/EMTDC模型,对提出的改进型策略进行验证。结果表明,改进型策略能有效避免因直流侧单极故障引起的非故障极换相失败。

Semicarbazide-Sensitive Amine Oxidase对血糖调节作用研究

Semicarbazide-Sensitive Amine Oxidase(SSAO)是一类在人体内广泛分布但生理功能尚不清楚的酶。本研究中我们首次在动物模型上发现了SSAO活性对大鼠血糖的影响。通过使用SSAO的高选择性抑制剂MDL-72974A以及它的内源性底物甲胺等对动物进行处理,研究血糖与SSAO活性的关系。SSAO活性用同位素标记法以14C-苯甲胺为底物进行测定,血糖则采用己糖激酶法测定。此外我们还测定了尿甲醛排泄以考察SSAO催化脱氨反应是否发生。实验结果显示,抑制SSAO活性可以导致动物血糖升高,并且SSAO底物甲胺可以降低糖尿病鼠血糖。这些结果表明SSAO可能在血糖调节方面有某种作用,进一步研究将对发展糖尿病治疗策略有重要意义。